[libc++] Add _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
It's useful to be able to disable visibility annotations entirely; for
example, if we're building libc++ static to include in another library,
and we don't want any libc++ functions getting exported out of that
library. This is a generalization of _LIBCPP_DISABLE_DLL_IMPORT_EXPORT.
Differential Revision: https://reviews.llvm.org/D26934
llvm-svn: 288690
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: fc6100c195fdcea56f08f4de27397867f0cc8fff
diff --git a/CMakeLists.txt b/CMakeLists.txt
index d40257a..ee95a2d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -518,7 +518,7 @@
# static library only we modify the headers to disable DLL import/export.
if (DEFINED WIN32 AND LIBCXX_ENABLE_STATIC AND NOT LIBCXX_ENABLE_SHARED)
message(STATUS "Generating custom __config for non-DLL Windows build")
- config_define(ON _LIBCPP_DISABLE_DLL_IMPORT_EXPORT)
+ config_define(ON _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
endif()
if (LIBCXX_NEEDS_SITE_CONFIG)
diff --git a/docs/UsingLibcxx.rst b/docs/UsingLibcxx.rst
index 8234994..1d2cc9e 100644
--- a/docs/UsingLibcxx.rst
+++ b/docs/UsingLibcxx.rst
@@ -149,3 +149,9 @@
This macro is used to enable -Wthread-safety annotations on libc++'s
``std::mutex`` and ``std::lock_guard``. By default these annotations are
disabled and must be manually enabled by the user.
+
+**_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS**:
+ This macro is used to disable all visibility annotations inside libc++.
+ Defining this macro and then building libc++ with hidden visibility gives a
+ build of libc++ which does not export any symbols, which can be useful when
+ building statically for inclusion into another library.
diff --git a/include/__config b/include/__config
index 1ab5776..a1efc3f 100644
--- a/include/__config
+++ b/include/__config
@@ -510,7 +510,7 @@
#ifdef _WIN32
-#if defined(_LIBCPP_DISABLE_DLL_IMPORT_EXPORT)
+#if defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
# define _LIBCPP_DLL_VIS
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
# define _LIBCPP_CLASS_TEMPLATE_INSTANTIATION_VIS
@@ -546,18 +546,30 @@
#endif // _WIN32
#ifndef _LIBCPP_HIDDEN
+#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_HIDDEN __attribute__ ((__visibility__("hidden")))
+#else
+#define _LIBCPP_HIDDEN
+#endif
#endif
#ifndef _LIBCPP_FUNC_VIS
+#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_FUNC_VIS __attribute__ ((__visibility__("default")))
+#else
+#define _LIBCPP_FUNC_VIS
+#endif
#endif
#ifndef _LIBCPP_TYPE_VIS
-# if __has_attribute(__type_visibility__)
-# define _LIBCPP_TYPE_VIS __attribute__ ((__type_visibility__("default")))
+# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
+# if __has_attribute(__type_visibility__)
+# define _LIBCPP_TYPE_VIS __attribute__ ((__type_visibility__("default")))
+# else
+# define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
+# endif
# else
-# define _LIBCPP_TYPE_VIS __attribute__ ((__visibility__("default")))
+# define _LIBCPP_TYPE_VIS
# endif
#endif
@@ -574,11 +586,15 @@
#endif
#ifndef _LIBCPP_EXCEPTION_ABI
+#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_EXCEPTION_ABI __attribute__ ((__visibility__("default")))
+#else
+#define _LIBCPP_EXCEPTION_ABI
+#endif
#endif
#ifndef _LIBCPP_ENUM_VIS
-# if __has_attribute(__type_visibility__)
+# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
# define _LIBCPP_ENUM_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_ENUM_VIS
@@ -586,7 +602,7 @@
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
-# if __has_attribute(__type_visibility__)
+# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS) && __has_attribute(__type_visibility__)
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS __attribute__ ((__type_visibility__("default")))
# else
# define _LIBCPP_EXTERN_TEMPLATE_TYPE_VIS
@@ -598,15 +614,27 @@
#endif
#ifndef _LIBCPP_INLINE_VISIBILITY
+#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__visibility__("hidden"), __always_inline__))
+#else
+#define _LIBCPP_INLINE_VISIBILITY __attribute__ ((__always_inline__))
+#endif
#endif
#ifndef _LIBCPP_ALWAYS_INLINE
+#if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__visibility__("hidden"), __always_inline__))
+#else
+#define _LIBCPP_ALWAYS_INLINE __attribute__ ((__always_inline__))
+#endif
#endif
#ifndef _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY
-# define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__visibility__("default"), __always_inline__))
+# if !defined(_LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS)
+# define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__visibility__("default"), __always_inline__))
+# else
+# define _LIBCPP_EXTERN_TEMPLATE_INLINE_VISIBILITY __attribute__((__always_inline__))
+# endif
#endif
#ifndef _LIBCPP_PREFERRED_OVERLOAD
diff --git a/include/__config_site.in b/include/__config_site.in
index ba0e8be..f2a1986 100644
--- a/include/__config_site.in
+++ b/include/__config_site.in
@@ -21,6 +21,6 @@
#cmakedefine _LIBCPP_HAS_MUSL_LIBC
#cmakedefine _LIBCPP_HAS_THREAD_API_PTHREAD
#cmakedefine _LIBCPP_HAS_THREAD_API_EXTERNAL
-#cmakedefine _LIBCPP_DISABLE_DLL_IMPORT_EXPORT
+#cmakedefine _LIBCPP_DISABLE_VISIBILITY_ANNOTATIONS
#endif // _LIBCPP_CONFIG_SITE